Lincoln Electric SVM127-A service manual Starting Problems

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F-20							F-20
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE				Observe Safety Guidelines
			detailed in the beginning of this manual.
PROBLEMS	POSSIBLE AREAS OF			RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)			COURSE OF ACTION
	STARTING PROBLEMS
The output voltage is too low to	1. Check the welding cables for			1. Check the	voltage	control
start the weld.	loose or faulty connections.			potentiometer	(R3)	and	the
	2. Put the Lincoln power source in			associated leads.		See	the
				Wiring Diagram.
	the "Machine	Control"	mode.
	Jumper the "BYPASS" pins on			2. The voltage PC board may be
	the LN-9 voltage PC board.			faulty. Replace.
	Adjust the weld voltage from the
	power source for the process
	being used. If the correct volt-
	age cannot be set, the power
	source may be faulty.
	3. Check for correct control cable
	connections	to the	power
	source.
	4. The control cable may be faulty.
	Check or replace.
	5. The start trimmer on the LN-9
	voltage PC board may be set too
	low. See Starting Characteris-
	tics in the Operation section of
	this manual.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.

LN-9 Wire Feeder